JP2003131576A - Seal for confirming unsealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal for confirming unsealing by which unsealing can be easily judged and reutilization after unsealing cannot be done. SOLUTION: The seal for confirming unsealing is constituted of multilayer structure incorporating an adhesive layer and a stretched layer. The seal has the multilayer structure in which the stretched layer with formed pattern is laminated on the adhesive layer or the stretched layer is laminated on the adhesive layer and an unstretched layer with formed pattern is laminated on the stretched layer and when unsealing and seal peeling are performed, the seal is stretched and preferably the pattern is destroyed. Preferably a protective layer is further laminated on the seal to increase mechanical strength and to prevent stretching of the seal when adhered on a body to be adhered.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an opening confirmation seal,
In particular, it relates to improvements in its constituent materials.

[0002]

2. Description of the Related Art In recent years, in order to provide consumers with a sense of security, the necessity of preventing foreign substances from being mixed in pharmaceuticals, cosmetics, foods, etc. and ensuring the safety of products has been highlighted. BACKGROUND ART Conventionally, in order to prevent foreign matter from entering, various packages have been devised, for example, by sticking an unsealing confirmation sticker on the exterior of a product so that the presence or absence of unsealing can be determined at a glance.
As a conventional general opening confirmation seal, a seal as shown in FIG. 6 (a) is known. The opening confirmation sticker 100 shown in the figure has a multi-layer structure including an adhesive layer 112, a pattern layer 114, a peeling layer 116, and a base material layer 118, and the pattern layer 114 is laminated on the adhesive layer 112. The peeling layer 116 is laminated on a part of the surface of the, and the base layer 118 is laminated on the pattern layer 114 with the peeling layer 116 sandwiched therebetween. The base layer 118 and the release layer 116 are in close contact with each other, and the release layer 116 and the pattern layer 114 are in close contact with each other, and the adhesive force between the adhesive layer 112 and the adherend 130 is between the base layer 118 and the pattern layer 114. It is characterized by being stronger than adhesive strength. When the seal is peeled off, the pattern layer 11
4, the release layer 116, and the base layer 118 are separated from the adhesive layer 112, and the pattern layer 114 is destroyed (FIG. 6).
(b)). Therefore, the presence or absence of opening can be confirmed by the destruction of the pattern layer 114. Even if the adhesive layer 112 is peeled off from the product after purchase of the product or when the seal for opening confirmation is unnecessary, the seal for opening confirmation has little adhesive residue and can be applied to a wide range of containers.

[0003]

However, the conventional opening confirmation seal has the base layer 106 and the release layer 1 at the time of release.
04 and a part of the pattern layer 102 is supposed to be separated from the adhesive layer 112, but a solvent is used,
If the adhesive strength of the adhesive layer was weakened by heating, it was possible to integrally peel the adhesive layer. Furthermore, since it retains its shape after peeling, it can be reused, and if it is reattached, it will be in the same state as before peeling, so it will be difficult to confirm whether or not it has been opened, and a seal that can prevent foreign matter from entering more reliably. Was wanted. The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide an unsealing confirmation seal that can be easily discriminated from the unsealing and cannot be reused after unsealing.

[0004]

In view of the above problems, as a result of intensive investigations by the present inventors, it was found that an unsealing confirmation seal using an elastic material as a base material is deformed at the time of unsealing. Has been completed.

The subject of the present invention is a seal for opening confirmation, which is characterized by having a multi-layer structure including an adhesive layer and a stretched layer. It is preferable that the seal has a multi-layer structure in which a stretched layer having a pattern formed thereon is laminated on an adhesive layer, and stretches in a pulling direction when unsealed and peeled from an adherend to destroy the pattern formed in the stretched layer. Is. The seal has a multi-layer structure in which a stretched layer is laminated on an adhesive layer, and a non-stretched layer having a pattern formed on the stretched layer is laminated, and the seal is stretched in a pulling direction when unsealed from an adherend, and non-stretched. It is preferable that the pattern formed on the layer is destroyed.

The above-mentioned seal has a protective layer laminated on the side of a layer on which a pattern is formed to increase mechanical strength, prevents the seal from stretching when it is attached to an adherend, removes the protective layer after attachment, and peels it off after opening. Sometimes it is preferred that the seal stretches. Further, the adhesive force between the protective layer and the layer on which the pattern is formed is 0.01 to 0.5.
It is preferably N / cm. The seal is formed by laminating a protective layer on the layer side where the pattern is formed to increase the mechanical strength,
It is preferable that the seal is stretched when it is attached to the adherend, and that the protective layer is separated from the layer on which the pattern is formed during opening and peeling. Further, it is preferable that the adhesive force between the adherend and the adhesive layer is 1 to 10 N / cm, and the adhesive force between the protective layer and the pattern-formed layer is 0.01 to 0.5 N / cm. is there.

The seal has a protective layer laminated between a stretched layer and a non-stretched layer to increase the mechanical strength, prevents the seal from stretching when it is attached to an adherend, and protects the stretched layer when unsealing and peeling. And the seal is stretched. Further, it is preferable that the adhesive force between the adherend and the adhesive layer is 1 to 10 N / cm, and the adhesive force between the protective layer and the stretched layer is 0.01 to 0.5 N / cm.

The seal has a protective layer having a thickness of 10 to 20.
It is preferably 0 μm. The seal preferably has a hologram pattern or an optical diffraction recording material. It is preferable that the stretched layer of the seal has plasticity. It is preferable that the stretched layer of the seal has elasticity. The seal preferably has a stretched layer containing a polyurethane resin, in which case the stretched layer preferably has a 100% modulus of 2 to 9 MPa and a tensile strength of 15 MPa or more. Is more preferably 600% or less.

In the present invention, "stretching" means extending in a plane parallel to the layers as shown in FIG. In the present invention, the elongation means the percentage of the ratio of the elongation between the gauge points on the test piece when pulled by a force of 1 N / cm and the original gauge point distance. Further, in the present invention, elasticity is defined as a deformation rate of less than 5% when the tensile tension is removed after stretching in the tensile direction, and plasticity is defined as a deformation rate of 5% or more.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The seal for confirming opening of the present invention is used by being attached to an opening portion of a product or the like by utilizing the adhesive force of the adhesive layer. In order to open the product or the like, it is necessary to peel off the seal, but since this seal has a stretched layer, when it is peeled off after being attached to the product or the like, it stretches in the pulling direction. Therefore, by using the unsealing confirmation sticker of the present invention, it becomes possible for anyone to easily determine whether or not the product to which the sticker is stuck has been opened. That is, by observing the seal after stretching, it is possible to immediately see that the pattern has been destroyed, and it is possible to easily visually determine whether the seal has been opened. The preferred embodiments of the present invention will be described below.

(1) First Embodiment Seal for Confirmation of Opening Having Adhesive Layer and Stretched Layer with Pattern Formed In the first embodiment of the seal 10 for confirmation of opening of the present invention, the adhesive layer 12 has a pattern. The drawn layer 14 thus formed has a multilayer structure in which the drawn layers 14 are laminated (FIG. 2A). Since it has a stretched layer, when it is peeled from the adherend 30, it is stretched in the tensile direction (FIG. 1), and the pattern formed in the stretched layer is destroyed. Therefore, by checking whether or not the pattern is deformed, anyone can easily check whether or not the bag is opened, which leads to prevention of foreign matter.

[0012]Stretched layer The stretched layer used for the seal for opening confirmation of the first embodiment is
A pattern is formed, has stretchability, and is attached to the adherend
Afterwards, it is extended in the pulling direction without breaking during opening and peeling.
Characterized by stretching.

The pattern formed on the stretched layer refers to all visually appealing patterns, which may or may not have a specific meaning in terms of content, and functionally,
It may be for the purpose of design, appearance decoration, or for information transmission. Examples of such a pattern layer include images of characters, numbers, symbols, figures, patterns, and tint blocks. The forming method may be various methods such as printing, and is not particularly limited as long as it can be confirmed to be destroyed by stretching, and a hologram or an optical diffraction recording material may be used.

The hologram or optical diffraction recording material can be obtained by a conventionally known method. The hologram can provide a stereoscopic effect, and the optical diffraction recording material can provide a pearlescent effect. Further, the hologram or optical diffraction recording material may be combined with a metal foil, a pigment or a pearlescent agent to improve the design.

The stretched layer may have elasticity or plasticity. When it has elasticity, the pattern formed on the stretched layer is preferably a hologram or an optical diffraction recording material. After unsealing and peeling, the seal returns to its original length, but once stretched, the structure that forms the hologram or optical diffraction recording body is destroyed and does not return to its original shape. You can confirm the presence or absence of opening by breaking. When it has plasticity, the pattern formed on the stretched layer is not necessarily a hologram or an optical diffraction recording material. After opening and peeling, the seal does not return to the original length and the pattern is collapsed (FIG. 2 (b)). Therefore, the presence or absence of opening can be confirmed by stretching the seal and destroying the structure forming the pattern.

The elongation is preferably 20 to 500%, and most preferably 50 to 200%. If it is 20% or less, it is difficult to distinguish the stretching of the seal or the destruction of the pattern, and if it is 500% or more, it is difficult to handle at the time of peeling.

As the stretched layer, polyurethane resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, silicone resin, etc. can be used. The stretched layer may have a single structure or a multilayer structure. If necessary, a curing agent may be added to adjust the strength and elongation. The stretched layer can also be colored by adding a pigment, a dye or the like to the resin used as the stretched layer.

Among the resins used for these stretched layers, polyurethane resin is particularly suitable. An important characteristic required for the stretched layer when actually using the seal for confirming opening is the appropriate stretchability and the tensile strength that makes it difficult to break even if it is peeled a little roughly. The present inventors have found that a polyurethane resin has these two characteristics in combination and is particularly excellent as a resin used for a stretched layer as compared with other resins. Polyurethane resins are also available in the market as organic solvent dispersions,
Fine adjustment of the thickness when forming a film is easy, and elongation and strength of the film can be easily adjusted by adding a curing agent.

[0019]Adhesive layer The adhesive layer serves to attach the seal to the product. Starting
In the case of Ming, the adhesive layer is made of acrylic, rubber, etc.
General adhesives can be widely used. Note that the adhesive
An adhesive layer is not always necessary when applied to a body.
Yes. In addition, stack release paper to protect the surface of the adhesive layer.
Layering is preferred. As release paper in the present invention
Is a paper made of silicone resin, wax, paraffin, etc.
Alternatively, a coating material such as a film is used.

[0020]Protective layer Protects the seal surface and increases the mechanical strength of the entire seal
Therefore, the protective layer 18 may be laminated on the stretched layer 14.
(Fig. 2 (C)). The pattern of the protective layer is visible from the outside
Be composed of highly transparent material to keep
Is preferred. The thickness of the protective layer is 10 to 200 μm, especially 3
It is preferably 8 to 50 μm. Thinner than 10 μm
The mechanical strength of the cousin does not increase sufficiently and is 200 μm.
If it is thicker, only the protective layer will separate when applied to the adherend.
I will The protective layer can be removed after application and left
I can do it.

When the protective layer is removed after sticking, it is preferable that stretching of the seal can be prevented when sticking to the adherend and stretching of the seal is not obstructed at the time of opening and peeling. The adhesive force between the protective layer and the stretched layer is preferably 0.01 to 0.5 N / cm, and particularly preferably 0.04 to 0.3 N / cm.
If it is weaker than 0.01 N / cm, the protective layer will separate during application, and if it is stronger than 0.5 N / cm, it will be difficult to remove the protective layer after application and the seal surface will be damaged.

When the protective layer is left after sticking, the protective layer should be separated from the stretched layer during opening and peeling so as not to hinder the stretching in the pulling direction during opening and peeling (FIG. 3).
It is preferable to adjust the adhesive force between the adherend and the adhesive layer to be stronger than the adhesive force between the protective layer and the stretched layer. Specifically, the adhesive force between the adherend and the adhesive layer is 1 to 10 N / cm,
The adhesive force between the protective layer and the stretched layer is 0.01 to 0.5 N / c.
It is preferable to set m, especially 0.04 to 0.3 N / cm. Then, the sticking of the seal can be prevented by the protective layer at the time of application, and the protective layer is separated from the drawn layer at the time of unsealing and peeling, which is preferable because it does not hinder the stretching of the seal. As the material of the protective layer, polyvinyl chloride, polyester, polycarbonate, acrylic resin, urethane resin or the like can be used.

(2) Second Embodiment Opening Confirmation Seal Having Adhesive Layer, Stretched Layer, and Non-Stretched Layer with Pattern Formed In the second embodiment of the opening confirmation seal of the present invention, the adhesive layer 12 is used. The stretched layer 14 is laminated, and a non-stretched layer 16 having a pattern formed on the stretched layer 14 is laminated (FIG. 4 (a)). Since it has a stretched layer, when it is peeled from the adherend 30, it extends in the tensile direction (FIG. 1) and the pattern formed on the non-stretched layer 16 is destroyed.
Therefore, by checking whether or not the pattern is broken, anyone can easily check whether or not it is opened, which leads to prevention of foreign matter.

[0024]Stretched layer Stretched layer used for the seal for confirming opening of the second embodiment
Has stretchability and ruptures after opening and peeling after being attached to an adherend
It is characterized by stretching in the pulling direction without
It The stretched layer may have elasticity or plasticity
Yes. When it has elasticity, the pattern formed in the non-stretched layer is
A hologram or an optical diffraction recording material is suitable.
After opening and peeling, the seal returns to its original length, but once stretched
The hologram or optical diffraction recording material formed on the non-stretched layer will not be destroyed.
Since it will not be broken and will not return to the original, hologram or optical diffraction
The presence or absence of opening can be confirmed by the destruction of the recording body. Plasticity
When it has, the pattern formed in the non-stretched layer is not always
It does not have to be a hologram or an optical diffraction recording body. Peeling open
The post-seal does not return to its original length, but the pattern formed on the non-stretched layer.
Is collapsed (Fig. 4 (b)), so the seal extension and
The presence or absence of opening can be confirmed by the destruction of the pattern.

The elongation is preferably 20 to 500%, and most preferably 50 to 200%. When it is 20% or less, it is difficult to distinguish the stretching of the seal and the breakage of the pattern formed in the laminated non-stretched layer, and when it is 500% or more, the handling is difficult at the time of peeling. As the stretched layer, the same stretched layer as in the first embodiment can be used. The stretched layer may have a single structure or a multilayer structure.

[0026]Non-stretched layer Non-stretched layer used for the seal for confirming opening of the second embodiment
Has a pattern formed on it and has no extensibility.
After pasting, the pattern formed when opening and peeling may be destroyed.
Characterize. The pattern formed on the non-stretched layer is the pattern of the invention.
Formed in the stretched layer of the first embodiment of the seal for confirmation of sealing
Similar patterns, contents, and formation methods can be used.

[0027]Protective layer Protects the seal surface and increases the mechanical strength of the entire seal
Therefore, the protective layer 18 may be laminated on the non-stretched layer 16.
Yes, you can (Fig. 4 (C)). The pattern of the protective layer is visible from the outside
It is made of a highly transparent material to maintain
And are preferred. The thickness of the protective layer is 10 to 200 μm, especially
It is preferably 38 to 50 μm. From 10 μm
If it is thin, the mechanical strength of the seal will not increase sufficiently,
If it is thicker than m, only the protective layer will separate when applied to the adherend.
I will end up. The protective layer can be removed after sticking or left
You can also

When the protective layer is removed after sticking, the stretching of the seal can be prevented at the time of sticking, and the stretching of the seal is not hindered at the time of opening and peeling, which is preferable. The adhesive force between the protective layer and the non-stretched layer is 0.01 to 0.5 N / cm, especially 0.04.
It is preferable that it is 0.3 N / cm. 0.01N
If it is weaker than / cm, the protective layer will separate during application,
If it is stronger than 0.5 N / cm, it is difficult to remove the protective layer after application and the seal surface is damaged.

When the protective layer is left after the sticking, the protective layer is separated from the non-stretched layer at the time of opening and peeling so as not to prevent the extension in the pulling direction at peeling of the seal (FIG. 3). It is preferable to adjust the adhesive force between the body and the adhesive layer to be stronger than the adhesive force between the protective layer and the stretched layer.
This is suitable because it is possible to prevent the extension of the seal at the time of sticking and to prevent the extension of the seal at the time of opening and peeling. Specifically, the adhesive force between the adherend and the adhesive layer is 1 to 10 N / c.
m, the adhesive force between the protective layer and the non-stretched layer is 0.01 to 0.5 N
/ Cm, preferably 0.04 to 0.3 N / cm. As the material of the protective layer, the same material as in the first embodiment can be used.

The adhesive layer in the second embodiment is
The same thing as what was demonstrated in 1st embodiment can be used.

A method of manufacturing the opening confirmation seal of the present invention will be described by taking the second embodiment as an example. A resin is applied on the release paper 20 using an applicator and dried to form the stretched layer 14 (FIG. 5A). The non-stretched layer 16 is laminated on the surface of the stretched layer 14, and characters and patterns are printed on the surface of the non-stretched layer 14. At that time, the protective layer 1 is provided on the non-stretched layer 16 side.
8 can also be laminated (FIG. 5 (b)). afterwards,
The release paper 20 is peeled off, an adhesive is applied to the stretched layer 14 side, and the adhesive is dried to form the adhesive layer 12 (FIG. 5).
(C)). Release paper 20 is attached to protect the surface of the adhesive layer and is sealed (FIG. 5D).

Since the unsealing confirmation seal of the present invention uses the stretched layer, sufficient adhesion is exhibited even on a curved surface or the like, which has been difficult to adhere to. Further, the shape of the seal is not particularly limited, but when used as a seal, it is necessary to stretch with a suitable force to destroy the pattern of the stretched layer or the non-stretched layer, or to separate the protective layer. Depending on the shape of the container or the like to be applied, a shape that allows the effect of the main seal to be easily exhibited is appropriately selected, and for example, a shape such as a circle, an ellipse, a strip, or a polygon is used.

The seal for opening confirmation according to the present invention is made of high-quality paper by selecting appropriate materials in consideration of adhesiveness, heat resistance, weather resistance, chemical resistance, etc., and forming each layer, depending on the product used. Paper such as art paper, mirror coated paper, Japanese paper, rough surface paper, E-stage general printing, UV printing, UV varnish, UV coated paper, press coated, various laminated paper such as PVC, PP, PET, etc., soft, hard , Vinyl such as foamed vinyl, ABS, AS, HiPS, AC, P
Plastics such as P and PET, bookbinding, albums, T
Various fibers such as shirts and cloth products, leather, glass, metal,
It can be used for various materials such as woodworking. The materials that can be used in the present invention are not limited to those listed here.

[0034]

EXAMPLES The present invention will be described more specifically below with reference to examples.
As will be appreciated, the scope of the invention is limited to these examples.
There is no such thing.Example 1 Polyurethane resin (SG410^TM:Surname
Co-Advance) coating thickness using an applicator
It was applied so as to have a thickness of 200 μm. Dry at room temperature for 12 hours
After drying, stretchable polyurethane sheet with a dry film thickness of 40 μm
Got Transfer holograms on the surface of stretchable polyurethane sheet.
Paste (made by Kurz Co., Ltd.) into a heating roller stretching machine
And pressurize it at 140 ° C to make the hologram stretchable.
Transferred to a urethane sheet. After that, peel off the release paper and apply an adhesive to the polyurethane surface.
(1549^TM: Three Bond Co., Ltd.) coating thickness 100μ
It was applied so that it would be m. Dry for 20 minutes at 50 ° C
A release paper was attached to make a seal. The resulting seal has a holographic image on the surface and is designed
It was beautiful.

[0035]Example 2 Polyurethane resin (Nipporan 5120
^TM: Made by Nippon Polyurethane Industry Co., Ltd.) and 100 parts of crosslinking agent
Then Coronate L^TM(Nippon Polyurethane Industry Co., Ltd.) 5
Applying the resin solution with mixed parts using an applicator
It was applied so as to have a thickness of 200 μm. Dry at room temperature for 12 hours
After drying, stretchable polyurethane sheet with a dry film thickness of 40 μm
Got Transfer holograms on the surface of stretchable polyurethane sheet.
Paste (made by Kurz Co., Ltd.) into a heating roller stretching machine
And pressurize it at 140 ° C to make the hologram stretchable.
Transferred to a urethane sheet. After that, peel off the release paper and apply an adhesive to the polyurethane surface.
(1549^TM: Three Bond Co., Ltd.) was applied. Fifty
Dry for 20 minutes at ℃, attach release paper and seal
did. The resulting seal has a holographic image on the surface and is designed
It was beautiful.

[0036]Example 3 Polyurethane resin (SG410^TM:Surname
Co-Advance) coating thickness using an applicator
It was applied so as to have a thickness of 200 μm. Dry at room temperature for 12 hours
After drying, stretchable polyurethane sheet with a dry film thickness of 40 μm
Got The surface of the stretchable polyurethane sheet has a yellow interference color pattern.
Pigment (Iriodin^{T M}: Made by Merck) 10 parts poly
Urethane resin (SG410^TM: Seiko Advance
Screen) using the ink prepared by dispersing
A 5 mm square alphabetic character was printed by the printing method. After that, peel off the release paper and apply an adhesive to the polyurethane surface.
(1549^TM: Three Bond Co., Ltd.) coating thickness 100μ
It was applied so that it would be m. Dry for 20 minutes at 50 ° C
A release paper was attached to make a seal.

[0037]Example 4 Polyurethane resin (Nipporan 5120
^TM: Made by Nippon Polyurethane Industry Co., Ltd.) and 100 parts of crosslinking agent
Then Coronate L^TM(Nippon Polyurethane Industry Co., Ltd.) 5
Applying the resin solution with mixed parts using an applicator
It was applied so as to have a thickness of 200 μm. Dry at room temperature for 12 hours
After drying, stretchable polyurethane sheet with a dry film thickness of 40 μm
Got The surface of the stretchable polyurethane sheet has a yellow interference color pattern.
Pigment (Iriodin^{T M}: Made by Merck) 10 parts nit
Rocellulose lacquer (Nitron 6341^TM: Musashi Nuri
(Made by Ryosha Co., Ltd.)
5mm square letters are printed by the screen printing method.
It was After that, peel off the release paper and apply an adhesive to the polyurethane surface.
(1549^TM: Three Bond Co., Ltd.) coating thickness 100μ
It was applied so that it would be m. Dry for 20 minutes at 50 ° C
A release paper was attached to make a seal.

[0038]Example 5 Polyurethane resin (Nipporan 5196
^TM: Made by Nippon Polyurethane Industry Co., Ltd.
It was applied so as to have a coating thickness of 150 μm. At room temperature
And dried for 12 hours.
A urethane sheet was obtained. Transfer holograms on the surface of stretchable polyurethane sheet.
Paste (made by Kurz Co., Ltd.) into a heating roller stretching machine
And pressurize it at 140 ° C to make the hologram stretchable.
Transferred to a urethane sheet. After that, peel off the release paper and apply an adhesive to the polyurethane surface.
(1549^TM: Three Bond Co., Ltd.) coating thickness 100μ
It was applied so that it would be m. Dry for 20 minutes at 50 ° C
A release paper was attached to make a seal. Obtained seal
Is a beautifully designed product with a hologram image appearing on the surface.
there were.

[0039]Comparative Example 1 Transferring holography on the surface of PET film with a thickness of 50 μm
Paste a sheet (made by Kurtz) and stretch with a heating roller
Machine is heated and pressurized at 140 ℃, PE hologram
Transferred to T film. After that, adhesive (1549^TM: Threebo
(Manufactured by Indo Co., Ltd.) was applied to give a coating thickness of 100 μm.
Dry for 20 minutes at 50 ° C and attach release paper
It was converted into

[0040]Peel test The seals obtained in Examples 1 to 5 and Comparative Example 1 are 1 cm.
Cut it into a square of 5 cm, and insert the glass bottle with the stopper
Attach it to the boundary and leave it for 12 hours at room temperature to adhere to the adhesive layer
Stabilized the adhesion to the body. Peel off from the end of the seal
Elongation in the pulling direction, pattern destruction, stretchable seeds
The possibility of reuse was investigated. The results are shown in Table 1.

[0041]

[Table 1]           Tension direction Pattern stretchability ReuseType of failure Example 1 Yes Yes Yes No plasticity Example 2 Yes Yes No elasticity Example 3 Yes Yes Yes No plasticity Example 4 Yes Yes Elastic Not possible Example 5 Yes Yes Yes No plasticityComparative Example 1 None None None Possible

The seals of Examples 1 to 5 provided with the stretched layer are
At the time of peeling, it was stretched in the tensile direction and the pattern was destroyed. The seals of Examples 1, 3, and 5 did not return to their original lengths after peeling (plasticity), and the seals of Examples 2 and 4 returned to their original lengths after peeling (elasticity). The destroyed pattern was irreversible and could not be reused. On the other hand, the seal of Comparative Example 1 in which the stretch layer is not provided does not stretch in the pulling direction at the time of peeling, the hologram is not destroyed, and there is no change in appearance after peeling, so that it can be reused by re-sticking. It was in such a state. Therefore, if the seals of Examples 1 to 5 are used, the presence or absence of opening can be easily confirmed by the destruction of the pattern, which is effective in preventing foreign matter from entering.

Next, the test evaluation of the resin used in the stretched layer was conducted.
went. The test method and evaluation criteria are as follows. <Test method> 50 μm thick from various polymer films,
Create a sample with a width of 10 mm and a length of 100 mm, and
Hold both ends of the pull with your fingers, and have the strength to easily peel off the seal.
When stretched in both ends with a force of about 1N
The stretchability and tensile strength were evaluated by sensory tests. <Evaluation criteria>Ease of growth ○ Easy to stretch △ Difficult to stretch × hardly stretchedTensile strength ○ Hard to break even when stretched suddenly △ Easy to break if stretched suddenly × Easy to break The evaluation results are shown in Table 2.

[0044]

[Table 2]Film material Ease of stretching Tensile strength Polyurethane ○ ○ Low density polyethylene × − Polypropylene × − Polyvinyl chloride (soft) △ △ Polyvinylidene chloride △ △Polyester (PET) × −

As is clear from Table 2, among the various resin films, the polyurethane film is particularly excellent in both the stretchability and the tensile strength. Therefore, it is particularly preferably used as the stretched layer used in the seal for opening confirmation of the present invention.

Next, a test evaluation was carried out in order to find out a suitable range of parameters relating to the polyurethane resin having excellent elongation and tensile strength as described above.
The test method and evaluation criteria are as follows. <Test method> The following three parameters measured according to JIS K 7311-1995 (Test method for urethane-based thermoplastic elastomer): 100% modulus (MPa): 100% on the test piece
The stress when an elongation of (that is, 2 times) is given, M ₁₀₀ = F ₁₀₀ / A, where M ₁₀₀ : Tensile stress (MPa) F ₁₀₀ : Load at the time of 100% elongation (N) A: Test piece Original cross-sectional area (cm ² ) ・ Tensile strength: Maximum load (MPa) up to cutting ・ Elongation: Polyurethane resin (Nipporan 5037) with various values for the multiple (%) of elongation from the initial measurement to cutting ^TM -Nipporan 5232 ^™ : manufactured by Nippon Polyurethane Industry Co., Ltd.) was used as a stretchable polyurethane sheet to make a seal in the same manner as in Example 1, and the sheet was attached to an ordinary glass container. After one day or more, the seal was peeled off from the container, and the performance as a seal material was evaluated according to the following evaluation criteria. <Evaluation Criteria> ○ Suitable △ Somewhat suitable × Not suitable Evaluation results are shown in Table 3.

[0047]

[Table 3]

From Table 3, from the viewpoint of tensile strength, it is preferable that the 100% modulus is 2 to 9 MPa and the tensile strength is 15 MPa or more, and if the ease of elongation is also taken into consideration, the elongation is 700% or less. Is preferred.

[0049]

By using the seal of the present invention, it is possible to obtain an unsealing confirmation seal in which unsealing can be easily discriminated and which cannot be reused after unsealing.

[Brief description of drawings]

FIG. 1 is a drawing in which an unsealing confirmation seal according to the present invention extends during peeling.

FIG. 2 is an explanatory diagram of an unsealing confirmation seal according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram at the time of peeling off the opening confirmation seal in which a protective layer according to the present invention is laminated.

FIG. 4 is an explanatory diagram of an opening confirmation seal according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a method for creating an opening confirmation seal according to the second embodiment of the present invention.

FIG. 6 is an explanatory view of a conventional unsealing confirmation seal.

[Explanation of symbols]

10 Opening confirmation sticker 12 Adhesive layer 14 Stretched layer 16 Non-stretched layer 18 Protective layer 20 Release paper 30 adherend

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayoshi Wada             2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa               Shiseido Research Center Co., Ltd.             Beach) (72) Inventor Tsuyoshi Miyamoto             2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa               Shiseido Research Center Co., Ltd.             Beach) (72) Inventor Tetsuyuki Osawa             2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa               Shiseido Research Center Co., Ltd.             Beach) (72) Inventor Asahi Kimura             2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama-shi, Kanagawa               Shiseido Research Center Co., Ltd.             Beach) F-term (reference) 3E062 AA09 AC06 DA01 DA02 DA07                 4F100 AK51B AR00C AS00D BA02                       BA03 BA04 BA07 BA10A                       BA10C BA10D BA25 DG10                       EH46 EH462 EJ37B EJ37E                       EJ86 EJ862 GB23 GB66                       GB90 HB00C JK01B JK07B                       JL13A JL14C JL14D JN26C                       JN30C YY00A YY00B YY00C                       YY00D

Claims (16)

[Claims] 1. A seal for opening confirmation, which has a multilayer structure including an adhesive layer and a stretched layer. 2. The adhesive layer has a multi-layer structure in which a stretched layer having a pattern is laminated, and stretched in a tensile direction at the time of peeling from an adherend to prevent the pattern formed in the stretched layer from being destroyed. The seal for opening confirmation according to claim 1, which is characterized in that. 3. A pressure-sensitive adhesive layer having a multilayer structure in which a stretched layer is laminated, and a non-stretched layer having a pattern formed on the stretched layer is laminated, and the stretched layer is stretched in a pulling direction when unsealed from an adherend. The seal for opening confirmation according to claim 1, wherein the pattern formed on the stretched layer is destroyed. 4. A protective layer is laminated on the side of a layer on which a pattern is formed to increase mechanical strength, to prevent extension of a seal at the time of sticking to an adherend, to remove the protective layer after sticking, and to seal at the time of opening and peeling. Is stretched, The opening confirmation seal according to any one of claims 1 to 3. 5. The seal for opening confirmation according to claim 4, wherein the adhesive force between the protective layer and the pattern-formed layer is 0.01 to 0.5 N / cm. 6. A layer in which a protective layer is laminated on the side of a layer on which a pattern is formed to increase mechanical strength, to prevent extension of a seal at the time of sticking to an adherend, and in which the protective layer is formed upon opening and peeling. Separated from the seal and the seal extends.
The seal for opening confirmation according to any one of 1. 7. The adhesive force between the adherend and the adhesive layer is 1 to 10 N.
/ Cm, the adhesive force between the protective layer and the layer on which the pattern is formed,
The opening confirmation seal according to claim 6, wherein the seal is 0.01 to 0.5 N / cm. 8. A protective layer is laminated between a stretched layer and a non-stretched layer to increase the mechanical strength, prevent the seal from stretching when it is attached to an adherend, and separate the protective layer from the stretched layer when unsealing and peeling. The seal for opening confirmation according to claim 3, wherein the seal is stretched. 9. The adhesive force between the adherend and the adhesive layer is 1 to 10 N.
/ Cm, the adhesive force between the protective layer and the stretched layer is 0.01 to 0.
The opening confirmation seal according to claim 8, wherein the seal is 5 N / cm. 10. The seal for opening confirmation according to claim 4, wherein the protective layer has a thickness of 10 to 200 μm. 11. The unsealing confirmation sticker according to claim 1, wherein the pattern is a hologram or an optical diffraction recording material. 12. The seal for opening confirmation according to claim 1, wherein the stretched layer has plasticity. 13. The seal for opening confirmation according to claim 1, wherein the stretched layer has elasticity. 14. The unsealing confirmation seal according to claim 1, wherein the stretched layer contains a polyurethane resin. 15. The stretched layer has a 100% modulus of 2 to 9M.
Pa and tensile strength are 15 MPa or more, The seal for opening confirmation of Claim 14 characterized by the above-mentioned. 16. The unsealing confirmation seal according to claim 15, wherein the stretched layer has an elongation of 700% or less.